Rate of change trigger for disk

[alubel]

I need to monitor when a filesystem reduces in size based on a rate of reduction rather than an actual number.

I have added this trigger:
{server.solaris.local:vfs.fs.size[/tmp,total].change(0)}>1073741824

Will this trigger when the difference between the last received value and the current value is greater than 1GB?

Thanks!

[alubel]

ok so it looks like this does indeed trigger, but I just got an alert that it grew and I need to know only if it gets smaller.. I suppose delta may be the answer?